Friend a



(No Model.)

F. A. PHBLPS 130.03 CHECK.

No. 526,164. Patented Sept. 18, 1894.

i UNITED. STATES ATENT .OFFICE.-

AND MESNE ASSIGNMENTS, TO COMPANY, OF SAME PLACE.

THE NEW, HAVEN SAFETY DOOR-GUARD D OOR-CH EC K. 1

` SPECIFICATION forming part of Letters Patent No. .526,164, dated September 18, 1894.

W Application fi1edApri12,1894: Serial to. 506,()50. (No model.)

To all whom it may concerm y ,Be it known that 1, FRIEND A. PHELPS, of New Haven,in the countyot' New Haven and State of Oonnecticut, have invented anew Im- 5 provenent in Safety Attachments for Door- Bolts; and I do hereby declare the following, when taken in connection with the accompaying draw'ings and the letters ot' reference marked thereomto be a full, clear, and exact IO description of the same, and which said drawings constitute part of this specification, and represent, ini Figure 1, a perspective View of a safety attachment for door-bolts const ructed in accordance with my invention, with the parts of the device in the positions which they will assume when the door is closed; Fig.2,asimilar View showing the door open to the extreme limit allowed by the attachment; Figl 3, a plan view of the device; Fig. 4, a detached broken plan View of the bolt-plate with the bolt shot back; Fig. 5, a sectional view of the said plate on the line a-.-b of Fig. 4; Fig. 6, a perspective View of the outer end of the bolt-plate link; Fig. 7, a detached view in elevation of the strike-plate with the strike-plate link removed.

My invention relates to an improvement in safety attachments for door-bolts, the object being to provide a simple, convenient and ef- `fective device, composed of few parts, and not liable to derangenent, by means of which a door may be securely locked ajar, for the purpose of ventilation.

` With these ends in View, my invention consists in a safety-attachment for door-bolts, having certain details of Construction and combinations of parts as will be hereinafter describedand pointed out in the claim. y

As hei-ein shown, my improved attachment consists of a strike-plate link A and a doorplate link A', each adapted at its inner end to be pivotally Secured together by a pintle A and constructedtoform a knuckle joint. 5 I do not, however, limit myself to Constructng them to form a knuckle joint, for their swinging movement on the said pintle might be limited in sone other way. y

The outer end of the strike-plate link A, is constructed with a vertically arranged eye a,

adapted to fit between two vertically perforated horizontal i lugs B B, formed integral ?with and projecting outward from the end of the strike-plate B' of the bolt, which has two screw-holes b b formed in it for securing it to i the casingof a door, and which is also constructed with a shallow groove b', to receive the bolt proper C. A pin B passing through the lugs B B, and through the eye a pivotally secures the link A to the said strike-plate. I

The outer end of the bolt-plate link A' is constructed to form a T-'shaped hook, and

anangle with respect to the link, and projects beyond the inner face thereof As shown it is something over twice as wide as the link is thick. The said bolt, as heren shown, is Secured by straps C' C' to the boltplate 0 which is constructed with screwholes cc for its application to a door, but which may be of any approved constructon,

so far as its prcvision to receive the bolt and to be put upis concerned.

The inner face of the shank a' is const-ructed So with a cam-like face a arranged to co-operate With the beveled inner end of the bolt, as will be set forth later on. The inner end of the said bolt-plate has a chambered head or housing D, formed integral with it, the said head being constructed with a vertical entrance slot D', to receive the cross-piece oa of the said T-shaped hook, with a wide transverse slot D to permit the swinging movement of the shank a' in the head, and with a circular chamber D adapted in diameter to permit the cross-piece a to turn in it after it has entered it through the transverse entrance slotD'. The entrance slot D' is located in a plane substantially parallel with the plane of the bolt, and under the Construction described, the transversely arranged crosspiece of the hook is only brought into that i plane When the two links are in their 'closed positions, which they assume only when the I bolt passes through the said head andthrough the chamber thereof.

When the door `is closed into position for the bolt to be engaged with the strike,in the usual mann'er for bolting the door, the links A and A' will stand in position in which they are shown in Figs. 1 and 3 of the drawings, or, if preferred, the T-shaped hook of the lnk A' may be disengaged from the chambered head of the bolt-plate C so as to permit the links to be swung back upon the casing of the door. A

If it is desiredto hold the door ajar or partly open for the purpose ofventilation, or for any other purpose, the T-shaped hook of the link A, is inserted into the entranceslot ofthe chambered head of the bolt-plate, and that, as I have already remarked, can be done only when the door is closed. NOW just as soon as the door is moved, the cross piece of the T-shaped hook is turned in the chanber of the cha-nbered head, so that it is impossible to disengage the T-shaped hook therefrom, wlereby the door is as securely locked against being opened farther than allowed by the length of the two links, as though it were closed and bolted. It will be readily seen that it is impossible to free the door for opening it by introducing the hand from the outside, and taking hold of the links and manipulating them, for the T-shaped hook of the link A', cannot be brought into the position required for disengaging it from the chamhered head of the bolt-plate without closing the door. In case the bolt should be shot outward when the attachment is in use, it will be pushed back without injury to the device, by means of the cam face a formed upon the inner face of the shank a', the said face acting upon the beveled inner end of the bolt.

It will be understood that it is not necessary to have the door opened to the full limit allowed by the two links for it is as securely locked with the links partially extended as when they are fully extended.

It' is apparent that in carrying out my 1n- Vention, some changes in the constructon herein shown and described may be made, and I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of ny invention;

I am aware, however, that it is old to construct a safety attach ment for doors with two links pivotally connected to each other at their inner ends, and respectively connected at their outer ends to the door and its janb. I`do not, thereforc, claim such a construction broadly.

Having full y described my invention, what I claim'as new, and desire to secure by Letters Patent, is

In a safety attachment for door-bolts, the combination with the strike and bolt-plates of a door-bolt, of two links having their inner ends pivoted together, the outer end of one link being pivoted to the strike-plate, and the outer end of the other link being constructed with a hook adapted tobe entered into a chanbered head With which the boltplate is provided, through an entrance-slot located in the said chambered head in such a position that the hook can be entered thereinto and removed therefron only when the door is closed, and a door-bolt mounted on the bolt-platc, and extending at its inner end through the chambered head thereof, substantially as described.

In testimony whereof I have sgned ths "specification in the presence of two subscribing witnesses.

FRIEND A. PHELPS.

witnesses:

FRED C. EARLE, GEO. D. SEYMOUR. 

